CUED Publications database

Corner effects in oblique shock wave/ boundary layer interactions in rectangular channels

Xiang, X and Babinsky, H (2017) Corner effects in oblique shock wave/ boundary layer interactions in rectangular channels. In: UNSPECIFIED.

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Abstract

© 2017 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. In a rectangular cross-section channel a separated oblique shock reflection is set to interact with the turbulent boundary layer (oblique SBLI) both on the bottom wall and in the corners formed by the intersection of the floor with the side-walls. To examine the mechanism as to how corner separations transmit their effects to the flow field elsewhere, an experimental investigation has been conducted in the Cambridge supersonic wind tunnel. Experiments were specially focused on modifications to the onset and magnitude of corner separations while keeping the strength and position of the incident shock unchanged in a M = 2.5 flow. Surface oil streak patterns indicated that three-dimensionality was not confined to the corner region and all flows were found to be three-dimensional. Both the shape and extent of the separated region in the centre of the tunnel floor were observed to be altered considerably by changes to the corner separation. More specifically, exaggerated corner separations caused the centreline separation shape to depart from the quasi-two-dimensional topology of the unmodified baseline flow. The separation length along the symmetry line of the bottom wall presented an increasing and then decreasing trend with growing corner separation. Simple explanations of how corner flow influences the rest of an oblique SBLI are provided. The proposed mechanism is based on the generation of corner shocks due to the displacement effect of corner separations. These corner shocks modify the adverse pressure gradient experienced by other parts of the flow field. The local separation length can therefore either be increased or reduced depending on the relative positions of corner shocks and the main oblique SBLI.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:26
Last Modified: 05 Sep 2017 01:51
DOI: